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Artykuły w czasopismach na temat „Dual Power Zone”

Autor: Grafiati

Data publikacji: 3 czerwca 2025

Data aktualizacji: 31 lipca 2025

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1

Wang, Ran, Xiaolin Wang, Jingwei Liu, and Jun Yang. "Dual-Zone Active Noise Control Algorithm." Applied Sciences 10, no. 1 (2019): 4. http://dx.doi.org/10.3390/app10010004.

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When active noise control (ANC) is applied to acquire a ‘quiet zone’, it may produce an increase in the sound power outside the quiet zone and a change in the primary sound field, which are undesirable in anti-detection and personal audio. To obtain a large noise reduction in the control zone and a small increase of sound power outside the control zone, three wideband ANC algorithms are proposed based on the acoustic contrast control (ACC), least-squares (LS), and least-squares with acoustic contrast control (SFR-ACC) algorithms. With a loudspeaker array as the secondary source, dual-zone ANC

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Davydov, A. E., B. M. Bochenkov, and Y. V. Pankrats. "Algorithms for dual-zone control of a permanent-magnet synchronous motor." iPolytech Journal 28, no. 1 (2024): 84–94. http://dx.doi.org/10.21285/1814-3520-2024-1-84-94.

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The article is aimed at extending the speed range of a permanent-magnet synchronous motor in the main-motion electric drive of a machine tool (while maintaining the power characteristics). In this work, the electric drive of a permanent-magnet synchronous motor was mathematically modeled using the SimInTech software. As input data for modeling, the following DC motor parameters were used: nominal power of 2.2 kW, voltage of 315 V, speed of 1500 rpm, energy conversion efficiency of 90.5%, and nominal current of 6 A. An algorithm for controlling the electric drive was developed to include two co

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Davydov, A. E., B. M. Bochenkov, and Yu V. Pankrats. "Extending the range of dual-zone permanent magnet synchronous motor control." Vestnik MGTU 27, no. 4 (2024): 486–500. https://doi.org/10.21443/1560-9278-2024-27-4-486-500.

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Achieving a twofold increase in the rotation speed of a permanent magnet synchronous motor while maintaining its power characteristics at the original level permits to increase the productivity and quality of material processing on metal-cutting machines. The theoretical study has been conducted using the mathematical model of a permanent magnet synchronous motor. The new control algorithm provides for two working zones: a nominal speed zone where the required power parameters are maintained (the first zone), and a high speed zone with a twofold increase in the rotation speed relative to the n

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Effah, Emmanuel K., Francis B. Effah, Philip Y. Okyere, and Emmanuel K. Anto. "Robust Adaptive Control of Dual Active Bridge DC-DC Converter with Constant Power Loading." Power Electronics and Drives 10, no. 1 (2025): 60–73. https://doi.org/10.2478/pead-2025-0004.

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Abstract The standard model reference adaptive control (MRAC) application to the Dual Active Bridge (DAB) converter has proven to achieve excellent dynamic and tracking responses under parametric uncertainty. However, it is sensitive to bounded non-parametric uncertainty caused by measurement noise and ripples in the output voltage produced in the electronic device. When left unchecked, it affects the system’s performance and may lead to instability. This paper investigates two robust modifications to the standard MRAC, namely the projection operator and dead zone techniques, to tackle the iss

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Švec, Pavol, Viliam Hrnčiar, and Alexander Schrek. "Study of Laser Welding of HCT600X Dual Phase Steels." Scientific Proceedings Faculty of Mechanical Engineering 22, no. 1 (2014): 93–98. http://dx.doi.org/10.2478/stu-2014-0016.

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AbstractThe effects of beam power and welding speed on microstructure, microhardnes and tensile strength of HCT600X laser welded steel sheets were evaluated. The welding parameters influenced both the width and the microstructure of the fusion zone and heat affected zone. The welding process has no effect on tensile strength of joints which achieved the strength of base metal and all joints fractured in the base metal.

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S, Andrusenko, Buhaichuk O, Budnychenko V, and Podpisnov V. "BUSINESS CASE FOR APPLICATION OF ENERGY STORAGE UNITS IN URBAN TRANSPORT AND HOME POWER GRIDS." National Transport University Bulletin 1, no. 46 (2020): 3–13. http://dx.doi.org/10.33744/2308-6645-2020-1-46-003-013.

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The article deals with the methodology of business case for application of energy storage units in urban transport and home power grids while using dual- and three-zone pricing; in addition it provides an example of the methodology application. The object of study are electrical grids with energy storage units. The purpose of the work is to develop the business case for application of energy storage units in urban transport and home power grids while using dual- and three-zone pricing. Methods of investigations - mathematical modeling of processes. As a rule, the volumes of electricity product

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7

Wang, Jinying, Shengyang Huang, Hongjian Gao, Ju Liu, Yubo Zhang, and Shuicai Wu. "Computer Simulations of Dual-Antenna Microwave Ablation and Comparison to Experimental Measurements." Applied Sciences 13, no. 1 (2022): 26. http://dx.doi.org/10.3390/app13010026.

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Single-antenna microwave ablation (MWA) is mainly used to treat small tumors less than 3 cm in diameter. To obtain a larger coagulation zone in a single ablation, a dual-antenna ablation approach was proposed. A three-dimensional finite element method (FEM) simulation model of parallel dual-antennas was developed. Ex vivo experiments at 50 W for 8 min were performed to verify the model. Both the temperature changes in tissue and the size of the coagulation zone were recorded. The effects of dual-antenna spacing, heating power, and blood perfusion on the coagulation zone were analyzed. Fifteen

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8

Wan, Wanglong, Zheng Qin, and Minggao Deng. "A New Method for Traveling Wave Localization in Wide Area Power Grid Based on Trusted Zone Identification of Fault Lines." Journal of Physics: Conference Series 2774, no. 1 (2024): 012012. http://dx.doi.org/10.1088/1742-6596/2774/1/012012.

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Abstract Aiming at the problem of dead zones in fault localization of wide area power grids, which makes it difficult to improve localization accuracy, a new method based on the trusted zone of fault lines for precise localization of wide area traveling waves is proposed. The algorithm is based on the principle of dual terminal positioning, which determines the fault line in the network through the action status of the circuit breaker, and determines the calculation area of network positioning based on the fault line, obtaining a set of dual terminal positioning calculation paths based on the

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9

Liu, Chunyu, Xiaodong Li, Run Luo, and Rafael Macian-Juan. "Thermal Hydraulics Analysis of the Distribution Zone in Small Modular Dual Fluid Reactor." Metals 10, no. 8 (2020): 1065. http://dx.doi.org/10.3390/met10081065.

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The Small Modular Dual Fluid Reactor (SMDFR) is a novel molten salt reactor based on the dual fluid reactor concept, which employs molten salt as fuel and liquid lead/lead-bismuth eutectic (LBE) as coolant. A unique design of this reactor is the distribution zone, which locates under the core and joins the core region with the inlet pipes of molten salt and coolant. Since the distribution zone has a major influence on the heat removal capacity in the core region, the thermal hydraulics characteristics of the distribution zone have to be investigated. This paper focuses on the thermal hydraulic

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10

Huang, Wenchang, Jiaqi Li, Shuai Wu, et al. "Dual-Frequency Impedance Matching Network Design Using Genetic Algorithm for Power Ultrasound Transducer." Micromachines 15, no. 3 (2024): 344. http://dx.doi.org/10.3390/mi15030344.

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Dual-frequency ultrasounds have demonstrated significant potential in augmenting thermal ablation efficiency for tumor treatment. Ensuring proper impedance matching between the dual-frequency transducer and the power amplifier system is imperative for equipment safety. This paper introduces a novel dual-frequency impedance matching network utilizing L-shaped topology and employing a genetic algorithm to compute component values. Implementation involved an adjustable capacitor and inductor network to achieve dual-frequency matching. Subsequently, the acoustic parameters of the dual-frequency HI

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11

Spadaccini, C. M., A. Mehra, J. Lee, X. Zhang, S. Lukachko, and I. A. Waitz. "High Power Density Silicon Combustion Systems for Micro Gas Turbine Engines." Journal of Engineering for Gas Turbines and Power 125, no. 3 (2003): 709–19. http://dx.doi.org/10.1115/1.1586312.

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As part of an effort to develop a microscale gas turbine engine for power generation and micropropulsion applications, this paper presents the design, fabrication, experimental testing, and modeling of the combustion system. Two radial inflow combustor designs were examined; a single-zone arrangement and a primary and dilution-zone configuration. Both combustors were micromachined from silicon using deep reactive ion etching (DRIE) and aligned fusion wafer bonding. Hydrogen-air and hydrocarbon-air combustion were stabilized in both devices, each with chamber volumes of 191mm3. Exit gas tempera

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Nassif, Nabil, and Iffat Ridwana. "Improving Building Energy Performance Using Dual VAV Configuration Integrated with Dedicated Outdoor Air System." Buildings 11, no. 10 (2021): 466. http://dx.doi.org/10.3390/buildings11100466.

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As building systems account for almost half of the total energy consumed by the building sector to provide space heating, cooling, and ventilation, efficiently designing these systems can be the key to energy conservation in buildings. Dual VAV systems with an effective control strategy can substantially reduce the energy consumption in buildings, providing a significant scope of further research on this system configuration. This paper proposes to utilize the warm air duct of the dual VAV system as a dedicated outdoor air (DOA) unit when no heating is required, which allows the cooling load t

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13

Ren, Sendong, Yihao Shen, Taowei Wang, Hao Chen, Ninshu Ma, and Jianguo Yang. "Effect of Laser Power on Formation and Joining Strength of DP980-CFRP Joint Fabricated by Laser Circle Welding." Polymers 17, no. 7 (2025): 997. https://doi.org/10.3390/polym17070997.

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In the present research, laser circle welding (LCW) was proposed to join dual-phase steel (DP980) and carbon fiber-reinforced plastic (CFRP). The welding appearance, cross-section of the welded joint and fracture surfaces were subjected to multi-scale characterizations. Joining strength was evaluated by the single-lap shear test. Moreover, a numerical model was established based on the in-house finite element (FE) code JWRIAN-Hybrid to reproduce the thermal process of LCW. The results showed that successful bonding was achieved with a laser power higher than 300 W. The largest joining strength

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14

Xiao, Jinsheng, Xu Wang, Xin Zhou, Pierre Bénard, and Richard Chahine. "A dual zone thermodynamic model for refueling hydrogen vehicles." International Journal of Hydrogen Energy 44, no. 17 (2019): 8780–90. http://dx.doi.org/10.1016/j.ijhydene.2018.10.235.

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Mazur, Viviane Teleginski, Sílvia Rosa Nascimento, Marilei de Fátima Oliveira, et al. "Laser Welding Influence on Corrosion Rate of Galvanized Sheets of DP600 Automobilistic Alloy." Materials Science Forum 1012 (October 2020): 436–40. http://dx.doi.org/10.4028/www.scientific.net/msf.1012.436.

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Corrosion rate behavior of laser welded dual-phase galvanized steel, DP 600, has been assessed in comparison with the material without the laser weld, in 3.5% NaCl solution. Three combinations of both scanning speed and laser power parameters were selected, maintaining the thermal input of 30 J mm-1, calculated as the ratio between the laser beam power [W] and the scanning speed [mm s-1]. The corrosion studies included measurements of open circuit potential, micro and macro polarization, showing higher corrosion rates as scanning speed decreased. Optical microscopy showed the formation of a gr

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16

Mohamad Noor, Noraishah, Haryanti Samekto, Ahmad Razlan Yusoff, et al. "Investigation on Elastic Behaviour of DP800 Dual Phase Steel." Advanced Materials Research 1134 (December 2015): 109–15. http://dx.doi.org/10.4028/www.scientific.net/amr.1134.109.

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The elastic relaxation behavior of dual phase steel DP800 is studied in this investigation, based on experimental and numerical methods the true stress-true strain curve obtained from a standard uniaxial tensile test differs according to angular rolling direction The relationship between true stress and true strain are presented in the form of power law equation. This form of material constitutive model shows that the strength coefficient and strain hardening exponent vary significantly in describing the nonlinear true stress-true strain relationship of the material. Finite Element (FE) calcul

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17

Mao, Yahui, Kelong Chen, Wei Ji, and Yanli Yang. "The Response of Soil Respiration to Temperature and Humidity in the Thermokarst Depression Zone of the Headwater Wetlands of Qinghai Lake." Biology 13, no. 6 (2024): 437. http://dx.doi.org/10.3390/biology13060437.

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As the climate warms, the thickening of the active layer of permafrost has led to permafrost melting and surface collapse, forming thermokarst landforms. These changes significantly impact regional vegetation, soil physicochemical properties, and hydrological processes, thereby exacerbating regional carbon cycling. This study analyzed the relationship between soil respiration rate (Rs), soil temperature (T), and volumetric water content (VWC) in the thermokarst depression zone of the headwater wetlands of Qinghai Lake, revealing their influence on these soil parameters. Results showed a signif

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18

Fu, Jia, Jurriaan van Slingerland, Hans Brouwer, Vitaliy Bliznuk, Ian Richardson, and Marcel Hermans. "Applicability Study of Pulsed Laser Beam Welding on Ferritic–Martensitic ODS Eurofer Steel." Metals 10, no. 6 (2020): 736. http://dx.doi.org/10.3390/met10060736.

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Pulsed laser beam welding was used successfully to join the oxide dispersion-strengthened (ODS) Eurofer steel. The joining was conducted with a laser power of 2500 W and a pulsed duration of 4 ms. With the filler material being used, a minor material loss and microvoids were observed in the joint. The microstructure of the fusion zone consists of dual phase elongated structures. The heat-affected zone has a width of around 0.06 mm with finer grains. The transmission electron microscopy observation reveals that nanoprecipitates are finely distributed in the fusion zone. The tensile strength, yi

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19

Luo, Hao, Jinsheng Xiao, Pierre Bénard, et al. "Improvement of MC method in SAE J2601 hydrogen refuelling protocol using dual-zone dual-temperature model." Journal of Energy Storage 81 (March 2024): 110416. http://dx.doi.org/10.1016/j.est.2024.110416.

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Abd Alla, G. H., H. A. Soliman, O. A. Badr, and M. F. Abd Rabbo. "Combustion quasi-two zone predictive model for dual fuel engines." Energy Conversion and Management 42, no. 12 (2001): 1477–98. http://dx.doi.org/10.1016/s0196-8904(00)00143-6.

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Yu, Cao, Min Su Kim, Hyung Chul Kim, and Youn Goo Yang. "A Low Power PFD and Dual Mode CP with Small Current Mismatch for PLL Application." Advanced Materials Research 457-458 (January 2012): 1178–82. http://dx.doi.org/10.4028/www.scientific.net/amr.457-458.1178.

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A high speed Phase-Frequency Detector (PFD) and Charge Pump (CP) are implemented using 0.13µm CMOS process with 1.2 V supply. The PFD is implemented with TSPC (True Single-Phase Clock) and positive edge triggered D flip-flop. Its polarity can be changed by setting the port. The dead zone problem is solved using an additional reset time. A single charge pump is implemented with two compensators. Dual mode CP design makes the charge pump much more flexible in applications. The current mismatch for the two modes is below 4.9 % within the voltage range of from 0.2 to 1.0 V.

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Fu, Hualing. "Between the Prerogative and the Normative States: The Evolving Power to Detain in China’s Political-Legal System." Law & Ethics of Human Rights 16, no. 1 (2022): 61–97. http://dx.doi.org/10.1515/lehr-2022-2006.

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Abstract This article uses Ernst Fraenkel’s dual-state framework as an analytical tool to study those conflicting imperatives and constitutional tensions with a focus on the power to detain. This article makes the argument that China has emerged as a dual state with a normal state that functions increasingly with a rule-based government in inter-personal matters and a prerogative state that solidifies control in areas that are regarded as political sensitive. Overall, while the equilibrium between the normative and prerogative states has been evolving in China, it has remained stable. The Part

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Carpenter, Chris. "Intermediate String Design Enhances Intelligent Deepwater Completions." Journal of Petroleum Technology 75, no. 05 (2023): 71–73. http://dx.doi.org/10.2118/0523-0071-jpt.

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_ This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper IPTC 22087, “One Innovative Intelligent Completion Intermediate String Design for Deepwater Gas-Well Completions: The Installation Case Study From L Gas Field, China,” by Shu Jie Liu, Yi Huang, and Wen Bo Meng, CNOOC, et al. The paper has not been peer reviewed. Copyright 2022 International Petroleum Technology Conference. Reproduced by permission. _ An intelligent completion design was installed in two wells in China’s L field deepwater project. Both wells have dual-zone stack-pack sand-control lowe

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Pan, Ying, and Juan Bao. "New Control Topology for Railway Static Power Conditioner." Applied Mechanics and Materials 596 (July 2014): 625–30. http://dx.doi.org/10.4028/www.scientific.net/amm.596.625.

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The traction power supply system of electric railway has the disadvantages of heavy unbalanced three phase, large harmonics and reactive power. Based on back-to-back converter, railway static power conditioner (RPC) can effectively balance the load between two arms, compensate the harmonic current and reactive power. As the conventional PI control is difficult to trace the waveform, a dual-loop control scheme was applied. The control scheme reduces the influences of the factors, such as sampling and calculation delay, dead-zone, parameters’ shift, on the system stability and enhances the robus

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Bendahan, J., W. G. J. Langeveld, V. Bharadwaj, J. Amann, C. Limborg, and Y. Nosochkov. "Vertical intensity modulation for improved radiographic penetration and reduced exclusion zone." International Journal of Modern Physics: Conference Series 44 (January 2016): 1660213. http://dx.doi.org/10.1142/s2010194516602131.

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In the present work, a method to direct the X-ray beam in real time to the desired locations in the cargo to increase penetration and reduce exclusion zone is presented. Cargo scanners employ high energy X-rays to produce radiographic images of the cargo. Most new scanners employ dual-energy to produce, in addition to attenuation maps, atomic number information in order to facilitate the detection of contraband. The electron beam producing the bremsstrahlung X-ray beam is usually directed approximately to the center of the container, concentrating the highest X-ray intensity to that area. Othe

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Carpenter, Chris. "Computer Vision Technology Monitors Safety Zones and Automates Drillpipe Tally." Journal of Petroleum Technology 74, no. 05 (2022): 70–72. http://dx.doi.org/10.2118/0522-0070-jpt.

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This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 208764, “A Better Set of Eyes: Computer Vision Technology To Monitor Safety Zones and Automate Drillpipe Tally,” by Douglas Watson, Helmerich and Payne; Kenneth Morton, CoVAR; and Sarah Kern, SPE, Helmerich and Payne, et al. The paper has not been peer reviewed. An indispensable item for every roughneck is the tally book, used to measure and count the drillpipe entering and exiting the wellbore. Traditional manual entry is prone to error, leading to potential mistakes in the calculated drilling dep

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Wu, Xiang-Dong, Mian Tian, Yao He, et al. "Short to Midterm Follow-Up of Periprosthetic Bone Mineral Density after Total Hip Arthroplasty with the Ribbed Anatomic Stem." BioMed Research International 2019 (June 27, 2019): 1–11. http://dx.doi.org/10.1155/2019/3085258.

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Background. Femoral bone remodeling around hip prosthesis after total hip arthroplasty (THA) is definite but unpredictable in time and place. This study aimed to investigate the implant-specific remodeling and periprosthetic bone mineral density (BMD) changes after implantation of the Ribbed anatomic cementless femoral stem. Methods. After power analysis, 41 patients who had undergone primary unilateral THA with the Ribbed anatomic cementless stem were included. BMD of the seven Gruen zones was measured by dual-energy X-ray absorptiometry, and the contact, fitness, and fixation of the femoral

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Ladron de Guevara-Torres, Juan Ernesto, Fernando Rodriguez-de la Garza, and Agustin Galindo-Nava. "Gravity-Drainage and Oil-Reinfiltration Modeling in Naturally Fractured Reservoir Simulation." SPE Reservoir Evaluation & Engineering 12, no. 03 (2009): 380–89. http://dx.doi.org/10.2118/108681-pa.

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Summary The gravity-drainage and oil-reinfiltration processes that occur in the gas-cap zone of naturally fractured reservoirs (NFRs) are studied through single porosity refined grid simulations. A stack of initially oil-saturated matrix blocks in the presence of connate water surrounded by gas-saturated fractures is considered; gas is provided at the top of the stack at a constant pressure under gravity-capillary dominated flow conditions. An in-house reservoir simulator, SIMPUMA-FRAC, and two other commercial simulators were used to run the numerical experiments; the three simulators gave ba

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Wu, Xinmi, Yu Zhang, and Jiawen Yang. "Neutral-Point Voltage Balancing Method for Three-Phase Three-Level Dual-Active-Bridge Converters." Energies 15, no. 17 (2022): 6463. http://dx.doi.org/10.3390/en15176463.

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Three-phase three-level dual-active-bridge (3L-DAB3) converters are a potential topology for high-voltage and high-power applications. Neutral-point voltage balancing is a complex and important issue for three-level (3L) circuits. Compared with the single-phase 3L dual-active-bridge converter, the self-balancing capability of the 3L-DAB3 is limited. To guarantee the reliability of the converter, a neutral-point voltage balancing method for the 3L-DAB3 is proposed in this paper. First, the neutral-point voltage balancing principle of the 3L-DAB3 is analyzed. Then, the relationship between the d

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Mallick, Rajashree, Ramanuj Kumar, Amlana Panda, and Ashok Kumar Sahoo. "Hard Turning Performance Investigation of AISI D2 Steel under a Dual Nozzle MQL Environment." Lubricants 11, no. 1 (2023): 16. http://dx.doi.org/10.3390/lubricants11010016.

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In recent years, hard turning has emerged as a burgeoning cutting technology for producing high-quality finishing of cylindrical-shaped hardened steel for a variety of industrial applications. Hard turning under dry cutting was not accepted because of the generation of higher cutting temperatures which accelerated tool wear and produced an inferior surface finish. Nowadays, minimum quantity lubrication (MQL) is widely accepted in hard turning to reduce the problems encountered in dry cutting. This research aimed to augment the MQL performance in the hard turning process of AISI D2 steel by app

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Zhao, Wei, Kai Wang, Rong Zhang, Huzi Dong, Zhen Lou, and Fenghua An. "Influence of combination forms of intact sub-layer and tectonically deformed sub-layer of coal on the gas drainage performance of boreholes: a numerical study." International Journal of Coal Science & Technology 7, no. 3 (2020): 571–80. http://dx.doi.org/10.1007/s40789-020-00317-0.

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Abstract High concentration and large flow flux of gas drainage from underground coal seams is the precondition of reducing emission and large-scale use of gas. However, the layered occurrence of coal seams with tectonically deformed sub-layers and intact sub-layers makes it difficult to effectively drain gas through commonly designed boreholes. In this study, the gas drainage performance in coal seams with different combinations of tectonically deformed sub-layers and intact sub-layers was numerically analyzed. The analysis results show that the gas drainage curve changes from a single-stage

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Carpenter, Chris. "Multivariate Characterization, Modeling of Paleo Zone Improves History Matching." Journal of Petroleum Technology 75, no. 04 (2023): 91–93. http://dx.doi.org/10.2118/0423-0091-jpt.

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_ This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper IPTC 22034, “Rigorous Multivariate Characterization and Modeling of Paleo Zone for Simulation Model History Matching Under Reservoir Uncertainty,” by Nader Y. Bu-Khamseen, SPE, Marko Maucec, SPE, and Anwar R. Awan, SPE, Saudi Aramco, et al. The paper has not been peer reviewed. Copyright 2022 International Petroleum Technology Conference. Reproduced by permission. _ The presence of a paleo zone, which frequently exists below free-water-level (FWL) surfaces, can affect dynamic reconciliation of reserv

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MATI, Ayache, Baadji BOUSAADIA, and Hamid BENTARZI. "A New Model of Numerical MHO Distance Relay Associated with Power Swing Detector." Algerian Journal of Signals and Systems 1, no. 2 (2021): 121–28. http://dx.doi.org/10.51485/ajss.v1i2.26.

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In conventional transmission line protection, a distance relay is used to provide the primary as well as backup protection. The voltage and current phasors measurement needed by the distance relay for determining the impedance may be affected by the power disturbances such as power swing. Consequently, this power swing may cause mal-operation of Zone three distance relays which in turn may affect on the reliability of the whole protective scheme. Many power swing blocking functions (PSB) have been developed to mitigate these effects. In this paper, a new model of Mho distance relay with dual-q

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Hickey, Darren, Paul Osenar, Nathan Palumbo, et al. "The Development of a Backup SOFC Generator at Upstart Power." ECS Meeting Abstracts MA2023-01, no. 54 (2023): 122. http://dx.doi.org/10.1149/ma2023-0154122mtgabs.

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Upstart Power is developing a state-of-the-art SOFC generator that provides backup power solutions for residential and industrial customers. The Upgen NXG™ fuel cell enables grid independence and pairs seamlessly with solar and/or standalone battery storage to provide extended backup power and 24/7/365 energy solutions. The system has dual fuel capability using either propane or natural gas and exports AC power via Enphase micro-inverters. Field trials are being conducted including a batch of 10 units in Puerto Rico running on propane in collaboration with Sunnova. The key technologies enablin

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Stovbun, N. S., and S. A. Gulyakov. "Development of the dual-channel frequency meter for measurements with hydrostatic pressure sensor." IOP Conference Series: Earth and Environmental Science 946, no. 1 (2021): 012018. http://dx.doi.org/10.1088/1755-1315/946/1/012018.

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Abstract The paper describes the process and the results of development of the dual-channel frequency meter, which function is to measure the output frequency generated by bottom-mounted pressure sensors. The sensors are actively used to monitor the marine environment. AVR family microcontrollers were used as the computing core of the presented device. This solution allows to obtain far lower power consumption, which is especially important when operating with no industrial power supply system in the coastal zone. As a result, we can deploy a reliable monitoring equipment capable of long-term

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Han, Yuhang, and Zhen Han. "Vegetation Carbon Source/Sink Dynamics and Extreme Climate Response in the Yangtze River Delta Coastal Zone." Sustainability 17, no. 4 (2025): 1456. https://doi.org/10.3390/su17041456.

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Coastal zones, as transition areas for sea/land interaction, have substantial carbon sequestration potential while also being particularly vulnerable to extreme climate. Consequently, it has become essential to evaluate the vegetation carbon sinks in coastal zone areas under extreme climate conditions. In this study, we evaluated the vegetation net ecosystem productivity (NEP) in typical regions within the Yangtze River Delta coastal zone from 2000 to 2020. We studied the regional and chronological properties of NEP and its response to extreme climate. The results revealed the following: (1) V

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Viňáš, Ján, Janette Brezinová, Henrich Sailer, et al. "Properties Evaluation of the Welded Joints Made by Disk Laser." Materials 14, no. 8 (2021): 2002. http://dx.doi.org/10.3390/ma14082002.

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The process of laser welding of sheets of HSLA (high-strength low-alloy steel), DP600 (dual-phase steel) and TRIP steels was investigated. A weld was successfully made in a double-sided hot-dip galvanized sheet with a thickness of 0.78–0.81 mm using a laser power of 2 kW per pass without any pretreatment of the weld zone. Microstructure studies revealed the presence of martensitic and ferritic phases in the weld zone, which could be associated with a high rate of its cooling. This made it possible to obtain good strength of the weld, while maintaining sufficient ductility. A relationship betwe

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Wang, Xiangyu, Hongwei Zhou, Lei Zhang, Wei Hou, and Jianchao Cheng. "Dual-Zone Gas Flow Characteristics for Gas Drainage Considering Anomalous Diffusion." Energies 15, no. 18 (2022): 6757. http://dx.doi.org/10.3390/en15186757.

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Gas drainage in deep coal seam is a critical issue ensuring the safety of mining and an important measure to obtain gas as a kind of clean available energy. In order to get a better understanding of gas flow and diffusion for gas drainage in deep coal seams, a dual-zone gas flow model, including the drainage damage zone (DDZ) and the non-damaged zone (NDZ), are characterized by different permeability models and anomalous diffusion models to analyze the influence of damage induced by drilling boreholes on gas flow. The permeability model and anomalous diffusion model are verified with experimen

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Chen, Songhua, D. T. Georgi, Oscar Olima, Hector Gamin, and J. C. Minetto. "Estimation of Hydrocarbon Viscosity With Multiple-te Dual-tw MRIL Logs." SPE Reservoir Evaluation & Engineering 3, no. 06 (2000): 498–508. http://dx.doi.org/10.2118/68021-pa.

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Summary We report a case study of using nuclear magnetic resonance (NMR) multiple-te, dual wait-time (tw) log acquisitions for quantitative characterization of San Jorge Basin reservoir oil viscosity. Previously, dual-tw logs have been used to discern gas and oil from water, while dual-te logs have been used as a qualitative light oil indicator. Although theoretically simple, quantitative determination of viscosity from dual-te logs is complicated by several factors, including poor signal-to-noise ratio, difficulties in separating oil from water, and the uncertainty of internal gradient streng

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Reddy, T. A., J. K. Kissock, S. Katipamula, and D. E. Claridge. "An Energy Delivery Efficiency Index to Evaluate Simultaneous Heating and Cooling Effects in Large Commercial Buildings." Journal of Solar Energy Engineering 116, no. 2 (1994): 79–87. http://dx.doi.org/10.1115/1.2930502.

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HVAC systems of large commercial buildings consume energy in excess of the sum total of the building loads. This excess energy use is due to the fact that a single air-handler unit in a HVAC system, having to provide conditioned air at different supply temperatures to different zones in the building, can do so only by resorting to either (a) a certain amount of mixing of cold and hot air streams as in dual-duct systems or (b) to terminal reheating in single-duct systems. This mixing of cold and hot air streams or terminal reheating result in an energy penalty which can be minimized by say, con

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Oleschuk, Valentin, and Mihai Tirsu. "Methods, Techniques, and Algorithms of Synchronous Multi-Zone Modulation of Signals of Voltage Source Inverters (literature review)." Problems of the Regional Energetics, no. 2(62) (April 2024): 52–74. http://dx.doi.org/10.52254/1857-0070.2024.2-62.06.

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This publication provides a brief overview of the results of research work in the field of developing alternative methods, schemes, and algorithms of synchronous multi-zone modulation of signals of inverters of power conversion systems with reduced switching frequency of power switches. In particular, in the mentioned researches, the basic strategies, schemes, and algorithms of synchronous multi-zone modulation have been fur-ther developed, modernized, modified, and disseminated in relation to new promising topologies of power conversion systems, including: two-inverter-based electric drives w

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Nan, Guofang, Sirui Yang, and Dengliang Yu. "Misalignment and Rub-Impact Coupling Dynamics of Power Turbine Rotor with Offset Disk." Applied Sciences 14, no. 3 (2024): 1298. http://dx.doi.org/10.3390/app14031298.

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When the dual rotor system of the aircraft engine is operating, the mass eccentricity of the power turbine rotor and the misalignment of the shaft coupling or the bearing will cause too large vibration of the rotor; this vibration leads to the rub-impact between the rotor and the casing. The power turbine rotor from the dual rotor system is taken as the research object in this paper. Considering the misalignment, the resulting rub-impact faults, the imbalance of rotor and the disk offset, the equation of motion for the system is developed according to the Lagrangian Equation, and then the Rang

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Uyulan, Caglar, Metin Gokasan, and Seta Bogosyan. "Dynamic Investigation of the Hunting Motion of a Railway Bogie in a Curved Track via Bifurcation Analysis." Mathematical Problems in Engineering 2017 (2017): 1–15. http://dx.doi.org/10.1155/2017/8276245.

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The main purpose of this paper is to analyze and compare the Hopf bifurcation behavior of a two-axle railway bogie and a dual wheelset in the presence of nonlinearities, which are yaw damping forces in the longitudinal suspension system and heuristic creep model of the wheel-rail contact including dead-zone clearance, while running on a curved track. Two-axle railway bogie and dual wheelset were modeled using 12-DOF and 8-DOF system with considering lateral, vertical, roll, and yaw motions. By utilizing Lyapunov’s indirect method, the critical hunting speeds related to these models are evaluat

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Fu, Jia, Ian Richardson, and Marcel Hermans. "Microstructure Study of Pulsed Laser Beam Welded Oxide Dispersion-Strengthened (ODS) Eurofer Steel." Micromachines 12, no. 6 (2021): 629. http://dx.doi.org/10.3390/mi12060629.

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Oxide dispersion-strengthened (ODS) Eurofer steel was laser welded using a short pulse duration and a designed pattern to minimise local heat accumulation. With a laser power of 2500 W and a duration of more than 3 ms, a full penetration can be obtained in a 1 mm thick plate. Material loss was observed in the fusion zone due to metal vaporisation, which can be fully compensated by the use of filler material. The solidified fusion zone consists of an elongated dual phase microstructure with a bimodal grain size distribution. Nano-oxide particles were found to be dispersed in the steel. Electron

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Wang, Xiang, Chunyu Liu, and Rafael Macian-Juan. "Preliminary hydraulic analysis of the distribution zone in the Dual Fluid Reactor concept." Progress in Nuclear Energy 110 (January 2019): 364–73. http://dx.doi.org/10.1016/j.pnucene.2018.10.015.

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Sun, Ligong, Yixin Luo, Zhiyao Deng, Jinchan Wang, and Bo Liu. "Novel Power-Efficient Fast-Locking Phase-Locked Loop Based on Adaptive Time-to-Digital Converter-Aided Acceleration Compensation Technology." Electronics 13, no. 18 (2024): 3586. http://dx.doi.org/10.3390/electronics13183586.

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This paper proposes an adaptive acceleration lock compensation technology for phase-locked loops (PLLs) based on a novel dual-mode programmable ring voltage-controlled oscillator (ring-VCO). In addition, a time-to-digital converter (TDC) is designed to accurately quantify the phase difference from the phase frequency detector (PFD) in order to optimize the dead-zone effect while dynamically switching an auxiliary charge pump (CP) module to realize fast phase locking. Furthermore, a TDC-controlled three/five-stage dual-mode adaptively continuously switched VCO is proposed to optimize the phase

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Menacer, Brahim, Naima Khatir, Mostefa Bouchetara, Ahmed Amine Larbi, and Cherif Belhout. "The Heat Transfer Study in the Diesel Engine Combustion Chamber Using a Two-Zone Combustion Model." Mathematical Modelling of Engineering Problems 7, no. 4 (2020): 614–20. http://dx.doi.org/10.18280/mmep.070414.

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The study of heat transfer phenomena in diesel engines is a very complex task considering the number of engine components such as intake and exhaust manifolds, lubricant oil and coolant subsystems, the different heat transfer mechanisms (conduction, convection, and radiation). This paper presents simulation results using a dual-zone model associated to GT-Suite simulation software for the calculation of convective heat transfer from gas to the cylinder wall, radiation heat transfer, gas pressure and temperature for low, partial and full load engine as a function of crank angle for a single-cyl

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Murzin, S. P., and M. V. Blokhin. "Selective modification of dual phase steel DP 1000 by laser action using diffractive optical element." Computer Optics 43, no. 5 (2019): 773–79. http://dx.doi.org/10.18287/2412-6179-2019-43-5-773-779.

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Experimental studies of shaping a CO2 laser beam with a reflective diffractive optical element have been performed. To increase the aperture of the initial beam, we used a collimator containing a system of two plane-convex spherical ZnSe lenses. For the focal line formed with the diffractive optical element in combination with the collimator, in addition to a 1.3-fold increase in the length, a decrease in the maximum beam power density was found to occur in the laser spot. It was demonstrated that under the laser action it is possible to generate in a two-phase steel sample regions of full har

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Karnaukhov, N. F., D. A. Smyatsky, M. N. Filimonov, and K. I. Rudnev. "Ensuring of the industrial robot link motion accuracy parameters in the low-speed zone." Vestnik of Don State Technical University 19, no. 4 (2020): 342–48. http://dx.doi.org/10.23947/1992-5980-2019-19-4-342-348.

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Introduction. The article is devoted to the search for a method of reducing the effect of friction links mobility industrial robot PR (production mechanism PM) with frequency-controlled electric drive (FCED) on the static error (accuracy) positioning of the working body (WB) when moving in a low speed zone. The random character of friction forces changes in the implementation process start-braking modes of induction motor (IM) operation create difficulties in performance specified technological process parameters. The formation of pulsating moments on the IM shaft, due to the stator IM current

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Gok, Ihsan M., M. Onur, Peter S. Hegeman, and Fikri J. Kuchuk. "Effect of an Invaded Zone on Pressure-Transient Data From Multiprobe and Packer-Probe Wireline Formation Testers." SPE Reservoir Evaluation & Engineering 9, no. 01 (2006): 39–49. http://dx.doi.org/10.2118/84093-pa.

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Summary This paper examines the effect of a mud-filtrate-invaded zone on pressure transients from multiprobe/packer-probe wireline formation testers (WFTs). Invasion zones are modeled as composite zones concentric with the wellbore that have different rock and fluid properties (permeability, porosity, viscosity, and compressibility) from those of the native uninvaded formation. The results show that for multiprobe wireline testers, the sink- (production) and horizontal-probe pressure responses are highly affected by the invaded-region properties, while the vertical-probe pressures are influenc

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